Observed arrival · 2026-11-14
Tandem: sync by way of an IMAP mailbox
Tandem is a protocol for keeping records in sync across people and devices, using an encrypted mailbox instead of a dedicated server.
○Open
⊠Login
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Households, friends, and small teams that trust one another
- Worth noticing
- Where system-keychain syncing is available, a new iPhone or Mac on the same Apple account may need no device pairing.
Field notes
Tandem adds its own identity and key-management layer above IMAP: a hub password approves new devices, while each collection's owner controls sharing and its encryption keys. The page says devices may avoid pairing when system-keychain keys sync, such as between an iPhone and Mac on one Apple account; it also warns that a writable member can vandalize a collection until removed.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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